i was worried about cleaning my canon t6 sensor. It had many dust specks that would not be blown out with my hand blower. I checked a few videos on youtube and read a couple "what not to do articles". The package comes with instructions as well. I put 2 drops on a swab and passed it. there was one dark particle that would not come out...I had to pass 4 swabs to get it out. Now thinking about it: I am not sure if the swab covered the entire sensor or not..I started with the swab in the right upper corner (when looking at the camera sensor) and passed it 3 times and the particle did not come out..i shined a bright light on the sensor and saw the particle in the bottom middle of the sensor so on pass #4 i started with the swab in the bottom right corner and everything worked.For some reason i am thinking that the width of the swab is not the same as the height of sensor.. maybe i am wrong, or thats how it is.Anyway, my sensor is perfectly clean.. this package was the one of the least expensive of the bunch.. I highly recommend to try this before spending $$$ of money to send in your camera (unless you have $$$ to spend)